Striae Inspection Instrument
This glass striae inspection system uses the schlieren method. In modern optical components, laser glass and precision measurement, small internal refractive index variations, or striae, can distort images, produce uneven light distributions and cause transmission errors that seriously impair performance. Such defects are almost invisible to the eye or conventional instruments under ordinary transmitted light. The schlieren system detects subtle refractive index changes and optical inhomogeneity inside and on the surface of glass. Small changes in light propagation direction convert internal density gradients and refractive index differences into clear images, revealing internal patterns even when the surface appears flawless.
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